When unexpected debris from outer space crashes onto their peaceful planet, the Clangers explore these strange arrivals with curiosity and wonder. From the debris, a dandelion seed gracefully floats onto the Clangers planet and begins to sprout. Tiny and Small Clanger quickly fetch their friend the Cloud to rain on the mysterious plant.

Flowers immediately begin sprouting from the stem. However, when the seeds scatter, the mysterious plant rapidly overtakes the surface of the Clangers' planet! Desperately needing help, the Clangers set off a distress signal.

The kind Sky Moos, large cow-like creatures with giant ears, come to the Clangers rescue, eating all the unwanted plants. Watching the Sky-Moos leave, the Clangers are incredibly grateful for the help of their generous friends.